52 CALIFORNIA ACADEMY OF SCIENCES. 



subocular plates, middle one very long and strongly 

 keeled. Superciliaries rather small, but strongly imbri- 

 cate. Eyelids with well developed fringe. Supralabials 

 strongly imbricate and produced laterally so as to give 

 snout a rounded outline when seen from .above. Infra- 

 labials small and juxtaposed. Several series of flat sub- 

 labials. Gulars granular and smooth, growing larger 

 and imbricate on posterior fold. Back and sides cov- 

 ered with scales or granules, largest near middle of 

 back and changing gradually to larger smooth ventrals. 

 A dermal fold usually present along each side between 

 limbs. Tail of moderate length, flattened near the 

 body. Its scales feebly keeled and slightly imbricate. 

 Limbs rather long, not very slender, eight to thirteen 

 femoral pores. 



The color above is gray, yellow, or brown, with two 

 or four series of dark undulate blotches and numerous 

 light spots. The blotches are often more or less obso- 

 lete and are most distinct in females and young. The 

 top of the head is colored like the back, but without 

 definite markings. The limbs may be unicolor or 

 crossed by dark bars. The throat is white or yellow, 

 sometimes marbled with dusky. The belly is white or 

 yellow with two or three black bars on the sides usually 

 surrounded with blue. The tail is grayish or brownish 

 above, white or yellow below. 



Length to anus 52 53 56 58 64 



Length of tail 40 58 66 55 56 



Snout to back of interparietal 9 9 10 10 11 



Width of head 9 9 9 10 11 



Fore limb 21 26 29 28 26 



Hind limb 33 42 44 43 40 



Base of fifth to end of fourth toe 12 17 17 17 14 



Distribution. This Holbrookia is very common in 

 Arizona and has been taken at Dome Canon, Nevada. 



